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Tokina 11-16 Problems
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<blockquote data-quote="pforsell" data-source="post: 498356" data-attributes="member: 7240"><p>I would begin the elimination process from the camera.</p><p></p><p>Have you checked the obvious (and cheaper) things, for example that the camera isn't at the moment in 'release priority' instead of 'focus priority' ? Check your focusing mode (AF-S or AF-C) and custom settings a1 and a2 (in most cameras).</p><p></p><p>The other thing that comes to mind is oxidized lens contacts. That can cause intermittent problems that are hard to reproduce.</p><p></p><p>If the camera is working properly and set up correctly, it *should* refuse to take a shot that's badly out of focus. </p><p></p><p>I'm not saying the culprit cannot be the lens, but I would begin by inspecting the camera first, since the AF logic and AF verification all happen in the camera. If the lens doesn't focus, the camera shouldn't fire. </p><p></p><p>Electric failure in the lens or contact loss makes the camera think the lens is full manual of course, and then it will fire every time, in focus or not.</p></blockquote><p></p>
[QUOTE="pforsell, post: 498356, member: 7240"] I would begin the elimination process from the camera. Have you checked the obvious (and cheaper) things, for example that the camera isn't at the moment in 'release priority' instead of 'focus priority' ? Check your focusing mode (AF-S or AF-C) and custom settings a1 and a2 (in most cameras). The other thing that comes to mind is oxidized lens contacts. That can cause intermittent problems that are hard to reproduce. If the camera is working properly and set up correctly, it *should* refuse to take a shot that's badly out of focus. I'm not saying the culprit cannot be the lens, but I would begin by inspecting the camera first, since the AF logic and AF verification all happen in the camera. If the lens doesn't focus, the camera shouldn't fire. Electric failure in the lens or contact loss makes the camera think the lens is full manual of course, and then it will fire every time, in focus or not. [/QUOTE]
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